Photoemission studies of fluorine functionalized porous graphitic carbon

Journal Article · Thu Mar 01 00:00:00 EST 2012 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3691888· OSTI ID:22038877

Ganegoda, Hasitha; Olive, Daniel; Cheng, Lidens; Segre, Carlo U; Terry, Jeff ^[1]; Jensen, David S; Linford, Matthew R ^[2]

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1. Department of Physics, Illinois Institute of Technology, Chicago, Illinois 60616 (United States)
2. Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602 (United States)

Porous graphitic carbon (PGC) has unique properties desirable for liquid chromatography applications when used as a stationary phase. The polar retention effect on graphite (PREG) allows efficient separation of polar and non-polar solutes. Perfluorinated hydrocarbons however lack polarizabilty and display strong lipo- and hydrophobicity, hence common lipophilic and hydrophilic analytes have low partition coefficiency in fluorinated stationary phases. Attractive interaction between fluorinated stationary phase and fluorinated analytes results in strong retention compared to non-fluorinated analytes. In order to change the selectivities of PGC, it is necessary to develop a bonded PGC stationary phase. In this study, we have synthesized perfluorinated, PGC using hepatadecafluoro-1-iodooctane, under different temperature conditions. Surface functionalization of the raw material was studied using photoelectron spectroscopy (PES). Results indicate the existence of fluorine containing functional groups, -CF, -CF{sub 2} along with an intercalated electron donor species. Multiple oxygen functional groups were also observed, likely due to the presence of oxygen in the starting material. These oxygen species may be responsible for significant modifications to planer and tetrahedral carbon ratios.

• OSTI ID: 22038877
• Journal Information: Journal of Applied Physics, Vol. 111, Issue 5; Other Information: (c) 2012 American Institute of Physics.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
BINDING ENERGY
ELECTRONS
FLUORINE
GRAPHITE
HYDROCARBONS
LIQUID COLUMN CHROMATOGRAPHY
MODIFICATIONS
PHOTOEMISSION
POLARIZABILITY
POROUS MATERIALS
RAW MATERIALS
RETENTION
SOLUTES
SURFACE TREATMENTS
SURFACES
X-RAY PHOTOELECTRON SPECTROSCOPY